4-122 (The compiler of the book narrated) that his father - may God be pleased with him - narrated that Ali ibn Musa ibn Ja’far ibn Abi Ja’far al-Kumaydany quoted Ahmad ibn Muhammad ibn Isa, on the authority of his father, on the authority of Hammad ibn Isa, on the authority of Hurayz, on the authority of Zurarah that Abi Ja’far al-Baqir (MGB) said, “The following four people cannot shorten their prayers whether they are at home or on a journey: quadruped keepers who rents them; those who drive the rented quadrupeds; the (long-distance) couriers; and the desert shepherds.”The compiler of the book said, “Courier refers to a postman.”